So, as they prepare to demonstrate this wonder of science to me at their modest offices near the Liffey, I feel all the excitement of Christmas Day. There is a test rig with wheels and cogs and four magnets meticulously aligned so as to create the maximum tension between their fields and one other magnet fixed to a point opposite. A motor rotates the wheel bearing the magnets and a computer takes 28,000 measurements a second. The magnets, naturally, act upon one another. And when it is all over, the computer tells us that almost three times the amount of energy has come out of the system as went in. In fact, this piece of equipment is 285% efficient.

That’s a lot of “free energy” and, supposedly, a slap in the face for one of physics’ most basic laws, the principle of conservation of energy: in an isolated system (the planet, say), energy can be neither created nor destroyed; it can only be converted from one form into another.